The Storm System 1 gal. Mystic Dune Exterior Wood Siding, Fencing and Decking Acrylic Latex Stain with Enduradeck Technology is a low sheen finish designed for use on decks and other exterior flat surfaces exposed to harsh weather conditions. This solid stain is manufactured with quality ingredients and state-of-the-art technology that provide a long-lasting, freshly finished look. It can be used on new or previously stained wood, properly pressure treated wood and composite decking.